Does anyone know how to purchase a Venice 36hr transportation pass/museum pass combo online, 7 days ahead? I read somewhere that you can get the combo pass but the Venice connected site doesn't offer that (that i can see). Is the museum pass really worth it? We are also wondering if it would be cheaper to wait until we get to Venice to purchase Rolling Venice cards for my 15 & 18yr olds and then purchase a transportation pass. We are taking a train into Mestre from Rome and I am assuming we can use these passes from there to hop on the bus to our hotel?? Any advice?